I MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THIS
SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, OR NON-INFRINGEMENT. I SHALL NOT BE LIABLE FOR ANY DAMAGES
SUFFERED AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
THIS SOFTWARE OR ITS DERIVATIVES.

GPS Display Version 1.6
Copyright (c) 1997 Jim Chandler

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.


This software parses the NMEA strings output by the Garmin GPS30PC and 
displays them.  The input source is a com port.  The command line is:

java gps [-debug] <com port>

As a minimum, the com port must be specified.

-debug prints the incoming NMEA strings to standard output

Specifying a com port tells the application where the source of the 
NMEA strings are: 1 is COM1, 2 is COM2, etc.

This program parses the following NMEA strings and describes what fields 
it is extracting from the string to be displayed.  The data is only 
displayed/updated when a valid position status has been indicated, except 
that the date and time are always displayed/updated if available.

$GPRMC - Time, Date, Latitude, Longitude (also used for valid position status)
$GPVTG - True Course, Mag Course, Velocity (knots), Velocity (kph)
$GPGGA - No of Sats, Antenna Height, Geodical Height, DGPS Availability
$GPGSA - 2D/3D fix availability
$PGRME - Est Horizontal Error, Est Vertical Error
$PGRMT - GPS30PC Temp

Suggestions for enhancements are welcome.  Email to n0vh@juno.com